<!DOCTYPE html>
<html>
<head lang="en">
  <meta charset="UTF-8">
  <title></title>
  <style>
    .dropdown {
      position: relative;
    }
    .dropdown-menu {
      position: absolute;
      display: none;
    }
  </style>
</head>
<body>

<div class="dropdown">
  <a href="#" data-toggle="dropdown">产品大全</a>
  <ul class="dropdown-menu">
    <li><a>冰箱</a></li>
    <li><a>洗衣机</a></li>
    <li><a>电视</a></li>
    <li><a>微波炉</a></li>
  </ul>
</div>


<script src="js/jquery-1.11.3.js"></script>
<script src="js/8.js"></script>
<script>
  /*$('.dropdown a').dropdown();*/
</script>
</body>
</html>